1. A does a work in 10 days and B does the same work in 15 days. In how many days they together will do the same work? (RRB, 2003)
a) 5 days b)6 days c)8 days d)9 days

2. A man can do a job in 15 days. His father takes 20 days and his son finishes it in 25 days. How long will they take to complete the job if they all work together?(Hotel Management, 2008)
a) Less than 6 days b) Exactly 6 days c) Approximately 6.4 days d) More than 10 days

3. A and B can do a piece of work in 8 days, B and C can do the same work in 12 days. A,B and C together can finish it in 6 days. A and C together will do it in: (RRB, 2007)
a) 4 days b)6 days c)8 days d)12 days

4. A works twice as fast as B. If B can complete a work 12 days independently, the number of days in which A and B can together finish the work is: (Asst. Grade 1997)
a) 4 days b)6 days c)8 days d)18 days

5. A is 50% efficient as B. C does half of the work done by A and B together. If C Alone can does the work in 40 days, then A,B and C can do the work in: (RRB, 2004)
a) 13 1/3 days b) 15 days c) 20 days d) 30 days

Ans: 1. (b) 2. (c) 3. (c) 4. (a) 5. (a)

Note: Main logic behind these problems is,

1. If A can do a piece of work in n days then A’s 1 day’s work = (1/n).
Example: If A can do a piece of work in 10 days then A’s one day’s work = (1/10).

2. If A’s one day’s work = 1/n, then A can finish the work in n days.
Example: If A’s one day’s work = 1/10, then A can finish the work in 10 days.

3. If A is thrice as good a workman as B, then :
Ratio of work done by A and B = 3 : 1.
Ratio of times taken by A and B to finish a work = 1 : 3.

Pattern 2

1. Sachin is younger than Rahul by 4 years. If their ages are in the respective ratio of 7 : 9 how old is sachin? (Bank PO, 2008)
a) 16 years b) 18 years c) 28 years d) Cannot be determined e) None of these

2. A man is 24 years older than his son. In two years, his age will be twice the age of his son. The present age of the son is: (RRB, 2007)
a) 14 years b) 18 years c) 20 years d) 22 years

3. Father is aged three times more than his son Ronit. After 8 years he would be two and a half times of Ronit’s age. After further 8 years, how many times would he be of Ronit’s age? (CBI, 2004)
a) 2 times b) 2 ½ times c) 2 ¾ times d) 3 times

4. A father said to his son, “I was as old as you are at present at the time of your birth”. If the father’s age is 38 years now, the son’s age 5 years back was: (Assist Grade, 2003)
a) 14 years b) 19 years c) 33 years d) 38 years

5. A person was asked to state his age in years. His reply was “Take my age three years hence, multiply it by 3 and then subtract three times my age three years ago and you will know how old I am.” What was age of that person? (SSC, 2004)
a) 18 years b) 20 years c) 24 years d) 32 years

9. Who was the Defense Minister of India during the India-China war of 1962?
a) Gulzarilal Nanda
b) Jagjivan Ram
c) V.K.Krishna Menon
d) None of themAns:c
10. What is the medical term used for the sleeplessness?
a) Hallucination
b) Insomnia
c) Somnambulism
d) None of theseAns:b

11. Which one of the following is an example of sedimentary rocks?
a) Loess
b) Basalt
c) Granite
d) GabbroAns:a

Ans:The King Fahd International Airport in Damman, Saudi Arabia. It takesup some 780 square kilometers - an area larger than many cities.

2. Which is the Highest Airport of the World?

Ans:Tucked within the Himalayas, Tibet in the Republic of China has the two highest airfields in the world. Bangda airport in eastern Tibet, which lies 15,548 feet above sea level, was opened on Oct. 22, 1994. It relegated Lhasa airport (14,315 feet) in Tibet's capital to second place among the world's highest airports.

3 . What is the Tallest Animal of the world?

Ans:Girraffe

4 . What is the Largest Animal (largest mammal too) ?

Ans:Blue Whale

5 . Which is the largest bay of the world? Ans:Hudson Bay, in Canada, is the world's largest bay measured by shoreline, which covers 12,268 kilometers or 7,623 miles

6 . Which is the Fastest Bird on Earth? Ans:Swift, cruises at 5 to 14 m per second and is capable of 60 m per second for short bursts

7 . Which is the Largest Bird?

Ans:Ostrich

8 . Which is the Smallest Bird?

Ans:Hummingbird

9 . Which is the Longest Bridge in the world?

Ans:Huey P Long Bridge in USA

10 . Which is the Tallest Building of world?

Ans:Burj Dubai, Dubai, The United Arab Emirates, 818 Meters

11 . Which is the Longest Canal of the world?

Ans:White Sea-Baltic Canal, Belomorsk to Povenets, Russia. 227km

12 . Which is the Largest Cathedral of the world?

Ans:Cathedral Church of St. John the Divine, New York

13 . Which is the Largest Cemetry of the world?

Ans:Ohlsdorf Cemetery in Hamburg, Germany

14 . Which is the Largest Church of the world?

Ans:St. Peter's Basilica Vatican City

15 . Which are the Largest Continent & Smallest Continent?

Ans:Largest-Asia Smallest-Australia

16 . Which is the largest Country by Area ?

Ans:Russia, 17,098,242 square Kms

17 . Which is Smallest Country by Area? Ans:Vatican City

18 . Which is the Highest City of the world?

Ans:Wenzhuan China

19 . Which are the Most populous Cities of the world (population and density)?